Electric-arc lamp.



K. VON DREGER.

ELECTRIC ARG LAMP.

APPLICATION FILED JUNI; 17, w09.

Patented May 14, 1912.

'UNITED STATES EATENT oEEicE.

KAEL von DREGER, or BERLIN, GER-H53@ AssiGNoRTo GESELLSCHAFT FR VER- l WERTUNG TECHNISCHER PATENTE GERMANY.

To all whom t mog/'00a cern.'

Be it known that l, KARL von DREGER, a subject ot' the Emperor of Austria-Hungary, residing in Berlin, in the Empire of Germany/have invented a new and 'useful Improvemcnt in Electric-Arc Lamps, of which `unsteadily and therefore causes fluctuations in the illumination. In order to avoid these -fluctuations of the long 'flame arc in accordance with 4the present invent-ion a plate of material which burns with difiiculty,sncl1 as asbestos for example, is arranged a 4small distance above the carbon.

This device, which may be termed a flameplate, extends throughout the entire effective Vlength of the carbon. The part of the flame which would otherwise flicker greatly in the upward direction spreads out beneath the fire proof plate and burns so steadily, that fluctuations in the light, which are caused by flickering of the flame of the burning lamp, are no longer perceptible.

The accompanying drawing shows a constructional form of sncha lamp.

lFigure 1 isa vertical cross section of one form of my lamp taken somewhat to one side of and parallel to the carbons. Fig. 2 is a bottom view of said lamp, showing the flameI plate arranged above the positive carbons, the negative .carbons with their holders being omitted in this view for clearness.

I Fig. 3 illustrates, approximately full size,

the manner in which the flame arc spreads beneath the i'ncoinbus'tible plate. Figft 1s a vertical Ysection taken on the line A-B of Fig. 3. Fig. 5 1s a diagrammatic cross section, which illustrates the arrangement of the plate for carbons located in a horizontal plane; the, thick positive carbon projects considerably beyond the thinner negative carbon so that the lightl is emittedapproximately in vthe direction indicated by the arrows. Here valso the luminous are spreads beneath thel iiicombu'st'ible plate. l

The sheet metal casing 1 contains a horizontal plate 2 on which 'two carbon fsupporting brackets 3 are rigidly fixed. Each bracket carries two'carbons which are superposed; the positive carbon 4 being some- Specification of Letters" Patent.

Application filed-taneL 17, 1909. vSerial No. 502,672.

EESCHRNKTER HAETUNG, 0E BREMEN,

unafraid-,Ansmann Patented May 14, 1912;

what longer than theinegative carbon 5, so that the crater of thel positive carbon 4. canl project its light downward uninipeded by the negative carbon. f f

The positive 'carbons 4 are `carried by 60 y lnetal holders 4 which are insulated from and nnmovably fixed on the brackets 8. The negative cai-bons 5 are mounted in the 4metallic holders G which are pivotally` mounted at 7 in theends ot the brackets 3. 65 The holders 6 comprise levers 8, which are outwardly directed, and are connected by rods 9 with the bifurcated levers 11, which latter are pivoted to the brackets 10.

Two iron armatures 13 are connected with 70 the levers 11 and are capable of movement ,i in the coil 14. The lamp is included in the circuit by means of the wires 20, 21',which are connected to pieces 22, 23, the latter being rigidly but insulatedly secured 'to the 75 lamp. lVithin the casing of the lamptwo' wires 24, 25 are connected to the pieces 22, 23 and each of these wires has two branches 26, 27 and 28, 29, respectively. lVhen the lamp-is switched ott, the springs 15 pull the 80 armatures 13 outwardly, lso that by the intermediary of the parts 8, 9 and 11, the free ends otthe negative carbons 5 move upwardly into contact with thelends of the positive carbons 4. v85 lVhen the lamp is switched in, the current y passes immediately through the wires20, 24, 26, the electro-magnet 14 the wires 28, 25 and 21, and at the same time through wire 27, the left handcarbons 4 and 5, :then 90 through the wire` j30 to the right 'hand-carbons, thence through the second carbon 5 and finally through wire 29to the wire 25. Accordingly the', two armatures are drawn into the coil 14 thus extending the springs 95 15 slightlyand by means of the parts 8, 9 vand 11, the negative carbons 5 are moved in such a manner. that they no longer contact with the positive carbons 4. whereby the arc is struck in the known manner. distance above the positive4 carbon, (which distance may be equal to the diameter of this carbon) a strong plate '16 of iron or some other appropriate material is arranged; by means of the support 17 this plate is immov- 10r ably connected with the said frame plate 2 of thelamp. 0n the under side of this plate 16 a layer of asbestos 18 or some other ap- :propriate material of appropriate thicknessis provided. The luminous are extending 1,10

At a I upward above die carbon 4 spreads against this incombustible layer 18 approximately as shown in Figs. 3 and 4:, whereby as already stated, any prejudicial flickering is rendered substantially impossible.

I claim:

A flaming are lamp comprising two pairs of carbons, each pair arranged substantially horizontal, one carbon of each pair being above the other carbon of said pair, said pairs of carbons having their respective burning tips 1Oppositely directed, the burning tips of the upper carbons normally projectin'g` beyond the (,iorresponding` burning tips of the' lower earbons, and a plate 'or steadyinte` the flaming arcs dcvelopedbenveen said carbons, said plate disposed above lie upper carbons and being out` of conact therewith In Witness wbereoil l have hereunto set my hand this lirs, day of lune 1909 in the presence of two subscribii'xg witnesses.

KARL vonr BERGER.

l/Viknesses lVOLniinAn HAUr'rf HENRY l-l'Asrnu.' 

